Decent setup for 5.1 on a PB17"?

[nukethenick]

I'm considering this setup, mainly for dvd playback but games too I guess.

Sonica theater for digital output
http://www.m-audio.com/index.php?do=products.main&ID=eee876ef2e6cbb4ac377f83c406e8885

and a logitech Z680 speaker set
http://www.logitech.com/index.cfm?p...ID=2&CONTENTID=5048&countryid=19&languageid=1

any thoughts on this setup, has anyone experience with either product?